Piston-valve.



M. CHRISTMAN L E. JOHNSON.l

PIsToN VALVE APPLICATION FILED 00T.31, 1907.

Patented Nov. 24, 1908.

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PISTON VALVE.

APPLICATION FILED 001231,. 1907.

Patented Nov. 24, 1908.

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' which the reversing rod UNTED STATES PATENT OFFICE.

MATTHIAS CHRISTMAN AND EDWARD JOHNSON, Ol" SPRING-FIELD, MISSOURI.

PISTON-VALVE.

No. 904,839. Specification of Letters Patent.

Application filed October 31, 1907. Serial No. 400,116.

ing rod F, and the valve O has uncovered the uppei steam port Fil, which will admit steam in the upper port in the left steam cylinder of the air pump through suitable ports oi' passages between both steam cylinders. The steam forces the left steam piston in the air pump down, which strikes the reversing rod F which is connected with the T o all whom it may concern:

Be it known that MATTHIAS Ormis'rMAN and EDWARD JOHN soN, citizens of the United l States, residing at Springfield, in the county l of Greene and State of Missouri, have inl vented certain new and useful Improvements l in a Reversing Piston-Valve, of which the following is a specification.

Our invention relates to ini arovements in valve O and moves the valve C down which l l a valves for air and liquid pumps, the object. closes the lower steam port E", and uncovers of which is to provide a reversing piston the upper steam port E1". Steam is then admitted to the right steam piston in the bottoni end through suitable ports 0r passages in the cylinder head of the air pump to the right steam cylinder. The right steam piston then moves upward, pulls the valve C up, which is connected with the reversing rod F and a plate tapped to the bottom of the,l right steam piston. The valve O then closes the upper steam port El, and the steam that has been expanded in the upper end of the left steam cylinder of the air pump, passes back through suitable ports or passages between both steam cylinders, back through the steam port El and out through the exhaust cavity cut in the valve O and out through the exhaust port D1, which corresponds with ports or passages in the cylinder head of the air pump, out into the atmosphere.

The lower steam port, E2, is now uncovered. Steam now passes over to the bottom of left steam piston in the air pump through suitable ports or passages in the cylinder head of the air pump. The left steam piston in the air pump is on an upward stroke. It pulls the valve O up, which is connected with the reversing rod F and a plate tapped to the bottom of the left steam piston in the air pump, the valve closes the upper steam port E3, and the steam that has been expanded in the lower end of the right steam cylinder of the air pump passes back through suitable ports or passages in the cylinder head of the air pump, back through the steam port E3, and out through the exhaust cavity cut in the valve O, and out through the exhaust port D2, which corresponds with suitable ports or passages in the cylinder valve that will be steam tight, durable and easily operated.

These objects we obtain by means of the i device illustrated in the accompanying drawings, forining a part of this specification in which:

Figure l, is a longitudinal, sectional view showing the entire device. Fig. 2, is a transverse view. Fig. 3, is the outer bushing, showing steam and exhaust ports. Fig. fl, is the end View of the inner bushing. Fig. 5, is a view showing the valve and bushing applied to a duplex pump.

A is the outer bushing having end A2.

B is the inner bushing that fits into the outer bushing A, and is provided with ribs B2, which separate inner and outer bushings, forming ports or passages A3, lengthwise of bushings and also has steam passages in each end B3.

O is a valve which is made circular to lit into the inner bushing B, and has radial braces or spokes at each end, and is provided with one or more packing rings O1 (and is provided with openings O2 at each end of valve). Said valve is made hollow so steam can pass through valve, which makes this valve perfectly balanced. Said valve is provided with a slip pin-hole O3, by F is put into place. The valve being similar to piston throttle valve, as is illustrated in prior Letters Patent #860190 granted to us on the 16th day of July, 1907. Serial #351379.

The valve operates as follows:

The invention is put into the steam chest of a pump as shown in Fig. 5.

ports at one Steam from the boiler enters at steam head of the air pump, out into the atmosports A2, and then passes through ports or pliere. passages A3, and then steam passes through The bushings can be made in one piece,

ports B3 to the valve O.

As shown in Fig. 5, the right steam piston has completed its stroke and forced the valve C down, which is connected with the reversbut are preferably made separate. The outer bushing made of steel or wrought iron. The

inner bushing made of cast iron; making it l cheap and easily renewed when worn.

Having thus described our invention what we claiin as new, and desire to secure by Letters-Patent of the United States:

l. In combination with an engine cylinder steam chest, suitable inlet and exhaust passages an outer bushing, an inner bushing, longitudinal uid passages between said bushings, a port at each end connecting the interior of the inner bushing with said longitudinal passages, a piston valve connected to reciprocate within the inner bushing, said valve comprising two heads spaced apart to forni an exhaust groove, spring packing rings on each head, and ports through both bushings to connect with said inlet and exhaust passages, substantially as shown and described.

2. In combination with an engine cylinder, steam chest, inlet and exhaust passages, a valve casing comprising two concentric bushings, uid passages between the bushings connected with the interior of the inner bushing at the ends thereof, a piston valve bored to receive a valve stern, a slip pin hole l to one side of and Connecting with the bore to allow the valve stem to be fitted, and a valve stein adapted to snugly fit said bore and having collars thereon to prevent endwise slipping of the valve, substantially as shown and described.

3. A piston valve having passages extending therethrough to permit of the valve being perfectly balanced, a central bore through which passes a valve stein, said valve stein fitted with collars at each end of the valve to prevent endwise slipping of the saine, and a slip pin hole adjacent to the bore byineans of which the valve stein may be fitted to the valve, substantially as shown and described.

In testimony whereof we aix our signatures, in presence of two witnesses.

MATTHIAS CHRISTMAN. EDWARD JOHNSON.

Vitn esses IV. IV. MERCHANT, ANNA RANKIN. 

